use a drag handle with icon

pdb-js/src/styles.scss

@@ -114,22 +114,21 @@ button.save-button:disabled {
   background-color: inherit;
 }
 
+.icon-tiny {
+  width: 1em;
+  height: 1em;
+}
+
 .icon-small {
   width: 1.5em;
   height: 1.5em;
 }
-.icon-small:hover {
-  background-color: #eee;
-}
 
 .icon-middle {
   width: 2.5em;
   height: 2.5em;
   margin: 0.2em;
 }
-.icon-middle:hover {
-  background-color: #eee;
-}
 
 .icon-large {
   width: 8em;
@@ -148,8 +147,6 @@ button.save-button:disabled {
   vertical-align: text-bottom;
 }
 
-
-
 a ,a:visited {
   color: blue;
   text-decoration: none;